# Barbarian's 100%-uptime Berserking loop: bypass Basic Skills entirely and cycle Core/Weapon-Mastery skills

Top Berserker builds maintain permanent Berserking not by chasing a proc, but by structuring the entire rotation so a Berserking-refreshing skill is always coming off cooldown before the buff can expire, using weapon-swap mechanics as the connective tissue between skills.

Diablo IV patch 3.2.1. Category: uptime loop. Evidence: Community claim.

## Detail
A documented rotation: Steel Grasp to pull/debuff, Double Swing (dual-wield) to refresh Berserking, Death Blow (2H Mace) for burst, Iron Maelstrom to clear the screen - with weapon swapping between these acting as the engine, since each swap also reduces the build's Ultimate cooldown by roughly 2 seconds.

## Why it works
Berserking's uptime is not a random proc in this design, it is a deterministic consequence of never leaving a gap between refresh-capable skill casts; the weapon-swap-driven Ultimate CDR is a bonus side effect of the same rotation rather than a separate system to manage.

## Numbers
Roughly 2 seconds of Ultimate cooldown reduction per weapon swap in the documented rotation.

## How to use it
Build the skill bar and swap timing around never having an idle window longer than Berserking's own duration, rather than relying on a single 'refresh' skill in isolation.